PDF AAT11671 Data sheet ( Hoja de datos )

Número de pieza	AAT11671
Descripción	INTEGRATED TFT LCD POWER SOLUTION
Fabricantes	Advanced Analog Technology
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No Preview Available ! Advanced Analog Technology, Inc. April 2009 AAT11671 Product information presented is current as of publication date. Details are subject to change without notice. INTEGRATED TFT LCD POWER SOLUTION FEATURES Built In 2A (Max.), 0.2Ω Switching NMOS Negative LDO Driver Down to –14V/+20mA VCOM Operational Amplifier Up to 350mA LDO Reset Signal Output for TCOM 28V High Voltage Switch for VGH Adjustable Soft-Start Function 1.2MHz Fixed Switching Frequency Fault and Thermal Protection Low Dissipation Current : Typical 2.3mA In Operation VQFN24-4*4 Package Available TYPICAL APPLICATION GENERAL DESCRIPTION The AAT11671 provides a step-up PWM controller, negative high voltage LDO drivers, low dropout linear regulator, VCOM operational amplifier and one high voltage switch (up to 28V) for TFT LCD display. RST pin will issue a reset signal to TCOM when VDD voltage is too low. The PWM controller consists of an on-chip voltage reference, oscillator, error amplifier, current sense circuit, comparator, under-voltage lockout protection and soft-start control circuit. The thermal and power fault protection prevents excessive power damaging internal circuit. The negative high voltage LDO drivers generate VOUT2 voltage (VGL) setting by external resistor divider. For the flicker compensation, VGH will be connected to VOUT3 when CTL is high and connected to ADJ when CTL goes low. The AAT11671 contains one operational amplifier capable of supplying 200mA to VCOM. With the minimal external components, the AAT11671 offers a simple and economical solution for TFT LCD power. PIN CONFIGURATION 24 23 22 21 20 19 CTL 1 VOUT3 2 VGH 3 ADJ 4 VREF 5 IN2 6 AAT11671 18 SW 17 VDD 16 EO 15 SS 14 VLV 13 OUT4 7 8 9 10 11 12 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Version 0.01 Page 1 of 18 http://www.Datasheet4U.com 1 page Advanced Analog Technology, Inc. April 2009 ELECTRICAL CHARACTERISTICS (VIN = 3.3V, VDD1 = 10V, unless otherwise specified.) N-MOS Switch PARAMETER Current Limit On-Resistance Leakage Current SYMBOL ILIM RON ISWOFF TEST CONDITION ISW = 1.0A VSW = 12V AAT11671 MIN TYP MAX UNIT -2-A - 0.2 - Ω - 0.01 20.00 µA Negative LDO Driver (Channel 2) PARAMETER SYMBOL TEST CONDITION MIN TYP MAX UNIT IN2 Threshold Voltage VIN2 IOUT2 = –100µA –15 0 +15 mV IN2 Input Bias Current IB2 VIN2 = –0.25V to +0.25V –40 0 +40 nA OUT2 Source Current IOUT2 VIN2 = 0.5V, OUT2 = –10V 4 20 40 mA Low Voltage LDO PARAMETER Input Voltage Range IN4 Threshold Voltage IN4 Input Bias Current Dropout Voltage LDO Output Current LDO Output Current Limit Line Regulation Load Regulation SYMBOL VVLV VIN4 IB4 VDROP IOUT4 ILIM4 TEST CONDITION IOUT4 = 100mA VIN4 = 0V to 1.5V IOUT4 = 250mA Measure VIN4, VVLV = 2.5 ~ 5V Measure VIN4, IOUT4 = 20mA ~ 300mA MIN 2.5 1.224 –40 - 350 - TYP - 1.240 0 350 - 500 MAX 5.5 1.256 +40 500 - - UNIT V V nA mV mA mA - - 5 %/V - - 0.1 %/mA – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Version 0.01 Page 5 of 18 5 Page Advanced Analog Technology, Inc. FUNCTION BLOCK DIAGRAM AAT11671 April 2009 AAT11671 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Version 0.01 Page 11 of 18 11 Page

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